Driving belt



Sept. 5, 1944.

G. A. FLECKENSTEIN DRIVING BELT Filed Dec. 30, 1943 l l ll 9:901:98 92 S'F/ecensiezh I alike M1414 I exam/55 Patented Sept. 5, 1944- DRIVING BELT-" George A. Fleckenstein, Stratford, Conn., assignor to The Singer Manufacturing Company, Elizaboth, N. J a corporation of New Jersey Application December 30, 1943, Serial No. 516,169

6 Claims.

This invention relates to power-transmission belts of the type employed, for example in sewing machines, to connect two shafts in positively timed or non-slipping relation to one-another, and has for an object to provide a driving belt with timing-clips which are positively anchored against displacement lengthwise of the belt.

With the above and other objects in view, as will hereinafter appear, the invention comprises -the constructive features, combinations and arrangements of parts hereinafter described in connection with the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Referring to the drawing, Fig. 1 is a vertical section of the bracket-arm standard portion of a sewing machine containing a driving-belt made in. accordance with the present invention, the section being taken lengthwise of the beltconnected shafts. Fig. 2 is a side elevation of the arm-shaft pulley of the machine and of a portion of the belt engaging said pulley.

The sewing machine, in part shown in the drawings has the usual bed-plate I, from which rises the hollow standard 2 of a bracket-arm 3. J ournaled in the bracket-arm 3 is a rotary actuating or arm-shaft 4 disposed in parallel relation to a bed-shaft 5 rotatably journaled below the bed-plate I. 1

Suitably secured upon the arm-shaft 4, for rotation therewith, is a belt-pulley 6 having the outer or belt-engaged face thereof provided with parallel grooves 1 extending crosswise of said face and spaced equally from each other circumferentially of the pulley, Embracing the pulley 6 are the spaced belt-confining guard-rings 8. The bed-shaft 5 likewise carries a belt-pulley 9 similarly provided wih grooves Ill and with a beltguard ring I I.

In accordance with the present improvement, the driving belt employed to transmit power from the arm-shaft 4 to the bed-shaft 5 comprises an endless band I2 having a flat inner or, pulley-engaging face. The band I2 may be made of suitably reinforced and vulcanized rubber or other suitable material, and is formed to provide the outer face thereof, i. e., the face opposite the pulley-engaging face, with a plurality of pairs of parallel lugs I3 and I4 integral with the band, which pairs of lugs are spaced from each other lengthwise of the band and extend Widthwise The lugs I3 and M of each pair of lugs are closely spaced to provide between them a clearance groove l5. Widthwise embracing the band [2 and snugly disposed in each of the grooves I5 are wire-clips I6 clamped upon the band I2 and in sidewise engagement with said lugs; each clip having its ends abutting preferably medianly of the width of the band. The clips l6 project from the inner or pulley-engaged face of the band I2 and are suitably spaced from each other lengthwise of the band to enter the grooves I and IU of the respective pulleys 6 and 9, thereby to prevent slippage of the belt upon the pulleys.

The clips l6 are securely anchored by the lugs l3 and I4 against displacement responsively to power-transmitting stresses, whereby the belt is adapted to accommodate heavy loads. Nevertheless, the relatively thinner portions of the belt between the pairs of lugs I3, I4 provide the requisite flexibility to permit the belt freely to embrace the pulleys.

Having thus set forth the nature of the invention, what I claim herein is:

1. A power-transmitting belt, comprising an endless band having one face thereof provided with a series of lugs spaced from each other lengthwise of the band, and clips embracing said band Widthwise of the band and anchored by said lugs against lateral displacement lengthwise of the band, said clips projecting from the face of the band opposite the lug-face thereof.

2. A power-transmitting belt, comprising an endless band having one face thereof provided with a plurality of pairs of lugs spaced from each other lengthwise of the band, and clips embracing said band Widthwise of the band and disposed between and in sidewise engagement with the lugs of the respective pairs of lugs, said clips projecting from the face of the band opposite the lug-face thereof,

3. A power-transmitting belt, comprising an endless band having a substantially flat pulleyengaging face and having the opposite face thereof provided with a plurality of pairs of lugs extending Widthwise and spaced from each other lengthwise of the band, and wire-clips disposed between and anchored by the lugs of the respective pairs of lugs, said clips projecting from the pulley-engaging face of the band.

4,, A power-transmitting belt, comprising an endless band having a substantially fiat pulleyengaging face and having the opposite face thereof transversely provided with a plurality of parallel lugs lengthwise disposed substantially normal to the length of the band, and wire-clips wise engagement with a lug of said band, and 4 said clips projecting from the face of said band opposite the lug-face thereof.

6. A power-transmitting belt, comprising an endless band having one face thereof provided with a plurality of lugs integral with and spaced from each other lengthwise of the band, said lugs extending crosswise of said band, and clips embracing said band widthwise of the band and disposed in engagement with said lugs, said clips 0 projecting from the face of said band opposite the lug-face thereof.

GEORGE A. FLECKENSTEIN. 

